The red light flashes on my NES and on the TV screen, it keeps on changing colors. Do you know whats wrong?

There's no reason that your NES shouldn't work flawlessly every time. The two major reasons for this problem is #1. an oxidized/filmy 72 pin connector in your machine, or oxidized/filmy pin contacts within your game. Classic old NES games have been around a long time and over time oxygen and humidity lead to oxidation of the contacts. You should always clean the game contacts if your games have set around for over a year before placing them in your Nintendo system. Especially if you just got a new 72 pin connector. The contacts are the brass colored metal surfaces that stick out the end of the game. You should know that if you do play your old games in your NES system uncleaned, they will contaminate your 72 pin pin connectors, transferring oxidation and deposit buildup, and cause your system to stop functioning correctly. This will result in poor contact, blinking screen or garbled or picture freezing while playing. It's relatively easy to clean any old NES, SNES or N64 games or games that you might find or purchase at auctions, garage sales or flea markets. The solution is really simple for "most" NEs owners. #1. open and clean your NES game contacts. And number two, pick up an old NES console 72 pin connector cleaner. You can get a used one (just as good) cheap. Clean your games, then stick that cleaner into your NES like a game 3 or 4 times and you should be up and running like new. If not, you need to replace your 72 pin connector.

The NES is touchy like that, sadly-- your problem isn't uncommon. My NES, and the NES of nearly every friend I have who still owns one, plays this little trick on them from time to time. Here's what we do:

1. Turn off the NES console.
2. Blow into bottom of the game, near the chip that connects to the NES.
3. Wipe away any excess dust from the game itself.
4. Blow into the console of the NES.
5. Wipe away any excess dust.
6. Re-insert the game and try again.

If this doesn't work, try placing the game in more delicately, or with more force. It's just a matter of trial and error, and sometimes it will work faster than others. Hope this helped!